<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<html>

    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <title>js 获取视频 demo</title>
<style type="text/css">
 
   .zhao{ 
  position: absolute;
 	left: 700px;
 	top:60px;
   
  }

</style>
    </head>
  
    <body onload="autoclick()">
      <form action="tttttt"> </form>
        <!-- 照相机 -->
        <video id="video" width="400" height="400" autoplay></video>
         <!-- 拍照事件 -->
        <button id="snap" name="zhaopian" style="display: none" ></button>     
        <!-- 图片 -->
         <div class="zhao">
        <canvas id="canvas"   width="400" height="400" ></canvas>
        </div>
        
       
    </body>
    <script type="text/javascript">
    //定时拍照
    function myclick()
    {
    	document.getElementById("snap").click();
    }
    function autoclick(){
    	setInterval("myclick()",1000);
    }  
        // Put event listeners into place
        window.addEventListener("DOMContentLoaded", function() {
            // Grab elements, create settings, etc.
            var canvas = document.getElementById("canvas"),
                context = canvas.getContext("2d"), //getContext唯一合法值2d
                video = document.getElementById("video"),
                videoObj = {
                    "video": true,
                    "audio": true
                },
                errBack = function(error) {
                    console.log("Video capture error: ", error.code);
                };

               
                
            // Put video listeners into place
            //navigator.getUserMedia =  navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia;
            if (navigator.getUserMedia) { // Standard 如果用户允许打开摄像头
                //stream为读取的视频流
                navigator.getUserMedia(videoObj, function(stream) {
                    video.src = stream;
                    video.play();
                }, errBack);
            } else if (navigator.webkitGetUserMedia) { // WebKit-prefixed  根据不同的浏览器写法不同
                navigator.webkitGetUserMedia(videoObj, function(stream) {
                    video.src = window.webkitURL.createObjectURL(stream);
                    video.play();
                }, errBack);
            } else if (navigator.mozGetUserMedia) { // Firefox-prefixed
                navigator.mozGetUserMedia(videoObj, function(stream) {
                    video.src = window.URL.createObjectURL(stream);
                    video.play();
                }, errBack);
            }
            document.getElementById("snap").addEventListener("click", function() {
                context.drawImage(video, 0, 0, 300, 300);
            });
        }, false);
        
   
        
    </script>
<a href="dl">退出</a>
</html>